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Measure relative humidity with weather bureau-type wet and dry bulb thermometers. Two organic liquid filled thermometers with white back glass are mounted in a pocket sized self-contained plastic case designed with a built in slide rule to convert wet and dry bulb readings to relative humidity, thus eliminating the need for calculating tables.

H-B&#174; B61503-0000 DURAC&#174; Compact Sling Psychrometer; -5/50&#176;C

h-b-b61503-0000-durac-compact-sling-psychrometer550

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